Research into indicates it is a specific maintenance update released around November 2022 for the Windows version of the utility suite. While the official software is distributed via installer, unofficial "Portable" versions found online are often modified by third parties to run without installation. Core Version Analysis (v6.0.1.3534)
This version primarily focused on stability and refining features introduced in the major 6.0 release: Parallels Toolbox 6.0.1.3534 | Portable
Parallels does not officially offer a "Portable" version of Toolbox. Users seeking a portable version should be aware of the following: Parallels Toolbox system requirements Research into indicates it is a specific maintenance